Ironside and The Originals are moderately entertaining dramas that feed off the success of previous shows.

The first Ironside, starring Raymond Burr, aired from 1967 to ’75. Blair Underwood ( The Event) stars in the remake, premiering tonight on NBC.

Through flashbacks, the pilot shows how Ironside lost the use of his legs: He was shot while on a case with partner Gary Stanton (Brent Sexton, The Killing). Before the shooting, Ironside had a fiancee and a bright future as a cop.

Although Ironside insists that he has accepted his physical status, a mountain of anger wells within — an emotion he taps to pursue bad guys.

The character exposition is set against the supposed suicide of a beautiful young woman who had worked in an investment company. Ironside suspects more to her death than first meets the eye — and, of course, he’s right.

The case isn’t overly interesting and the show is a standard police procedural. But, if the point of Ironside is to show a guy who’s more able at solving crimes than any walking detective, the crimes must be worthy.

Underwood is OK, if a little too hungry to chew the scenery. But the supporting cast is very good — including Sexton as the other shooting “victim,” who feels guilty for not having his partner’s back.

The Originals, premiering Thursday on the CW, is a spinoff of a CW hit show, The Vampire Diaries.

The new series centers on actual vampires as well as witches and hybrids — or werewolf-vampire mixes.

In truth, The Originals is even more than a typical spinoff.

Usually, the offspring show pulls one or maybe two characters from the original, but The Originals has imported a small truckload, including the jolly Mikaelson clan — vampire Elijah (Daniel Gillies), sister Rebekah (Claire Holt) and Niklaus (Joseph Morgan).

Klaus, as the last one is known to friend and foe, returns to New Orleans because the witch Jane-Anne Deveraux (Malaya Rivera Drew) is conspiring against him.

The performances are over-the-top and enjoyable. Morgan gets a little Shakespearean here and there, but that’s what vampire-show fans want.

It’s all fun because it’s shamelessly preposterous. Despite the new characters, The Originals isn’t original at all — but that’s why it stands a chance of doing well among Vampire Diaries fans.